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Functional expression of single-chain Fv antibody in the cytoplasm of Escherichia coli by thioredoxin fusion and co-expression of molecular chaperones.

Abstract：

:The production of a single-chain variable fragment (scFv) antibody against bovine ribonuclease A in the cytoplasm of Escherichia coli trxB/gor double mutant was investigated. Previous reports have shown that the thioredoxin (Trx) protein fusion strategy is useful for the correct folding of scFvs and that the expression of functional scFvs is increased by co-expression of molecular chaperones. In the present study, we examined the effects of the combination of Trx fusion and molecular chaperone co-expression on the production of a functional scFv. A Trx-fused scFv was obtained in the oxidizing cytoplasm, and co-expression of GroELS and trigger factor had the greatest effect, resulting in a 2.8-fold increase in specific productivity. By contrast, the molecular chaperone DnaKJE had no effect. Moreover, co-expression of DnaKJE with GroELS negated the effects of GroELS. Trx-scFv was purified using a bovine ribonuclease A-coupled Sepharose column, and 2.7 mg/L of purified protein was obtained. Soluble Trx-scFv, expressed and purified as described above, exhibited pH-dependent binding similar to that of the parental full-length antibody. In addition, approximately 80% of the initial binding activity was retained after incubation at 37 degrees C for 2 weeks, indicating that the Trx-scFv fusion protein is quite stable. This strategy might be useful for the preparation of other recombinant scFvs.

journal_name

Protein Expr Purif

journal_title

Protein expression and purification

authors

Sonoda H,Kumada Y,Katsuda T,Yamaji H

doi

10.1016/j.pep.2009.11.003

subject

Has Abstract

pub_date

2010-04-01 00:00:00

pages

248-53

issue

2

eissn

1046-5928

issn

1096-0279

pii

S1046-5928(09)00293-9

journal_volume

70

pub_type

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